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Unix Version 7 - man page for rf (v7 section 4)

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RF(4)											    RF(4)

       rf - RF11/RS11 fixed-head disk file

       This file refers to the concatenation of all RS-11 disks.

       Each  disk  contains  1024  256-word  blocks.   The  length  of	the  combined  RF file is
       1024x(minor+1) blocks.  That is minor device zero is taken to be 1024 blocks  long;  minor
       device one is 2048, etc.

       The rf0 file accesses the disk via the system's normal buffering mechanism and may be read
       and written without regard to physical disk records.  There  is	also  a  `raw'	interface
       which  provides for direct transmission between the disk and the user's read or write buf-
       fer.  A single read or write call results in exactly one I/O operation and  therefore  raw
       I/O  is	considerably more efficient when many words are transmitted.  The name of the raw
       RF file is rrf0.  The same minor device considerations hold for the raw interface  as  for
       the normal interface.

       In  raw	I/O  the buffer must begin on a word boundary, and counts should be a multiple of
       512 bytes (a disk block).  Likewise seek calls should specify a multiple of 512 bytes.

       /dev/rf0, /dev/rrf0

       The 512-byte restrictions on the raw device are not physically necessary,  but  are  still

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